The following table shows 10 communities ranked by decayed, missing, or filled (DMF) teeth per 100 children and fluoride concentration in ppm in the public water supply:

Rank by Rank by Community DMF Teeth per 100 Children (X)

Fluoride Concentration

(Y) Community DMF Teeth per 100 Children (X)

Fluoride Concentration

(Y)

1 8 1 64 7 2 9 3 71 10 3 7 4 85 6 4 3 9 96 5 5 2810 10 2 Do these data provide sufficient evidence to indicate that the number of DMF teeth per 100 children tends to decrease as fluoride concentration increases? Let a ¼ :05.